76 



The Root soon dies away, and is replaced by fresh 

 roots, wMch are developed from the bases of the 

 leaves. 



The Foot shrivels up. 



The Cotyledon persists until six or eight new leaves 

 are formed. 



APOSPORY. 



The ProthaUium may be produced from the rxidi- 

 me?its of a Spar any ium or be a direct outyrowth from 

 the leaf. (Normally it is produced by the germination 

 of a spore.) 



APOQAMY, 



The Fern Plant may be produced on the pro- 

 thallium by the outyrowth of a few cells and not be 

 produced as the result of the fertilization of an 

 archegonium. 



INDICATIONS OP TRANSITION. 



If the prothallia be grown in crowds they produce 

 nothing but antheridia. In Asjndium. this is to be 

 regarded as a pathological phenomenon, but in the 

 other Crj^ptogams, e.g., Horsetails, it is regularly 

 realised. 



ALTERNATION OP GENERATIONS. 



The Pern Plant produces the Sporangia ) c 7 / 

 The Sporangia produce the Spores \ c t 



The Spore produces the ProthaUium. ) 



